100 lines
2.9 KiB
C
100 lines
2.9 KiB
C
/* The IGEN simulator generator for GDB, the GNU Debugger.
|
|
|
|
Copyright 2002, 2007, 2008, 2009 Free Software Foundation, Inc.
|
|
|
|
Contributed by Andrew Cagney.
|
|
|
|
This file is part of GDB.
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program. If not, see <http://www.gnu.org/licenses/>. */
|
|
|
|
|
|
/* Creates the files semantics.[hc].
|
|
|
|
The generated file semantics contains functions that implement the
|
|
operations required to model a single target processor instruction.
|
|
|
|
Several different variations on the semantics file can be created:
|
|
|
|
o uncached
|
|
|
|
No instruction cache exists. The semantic function
|
|
needs to generate any required values locally.
|
|
|
|
o cached - separate cracker and semantic
|
|
|
|
Two independant functions are created. Firstly the
|
|
function that cracks an instruction entering it into a
|
|
cache and secondly the semantic function propper that
|
|
uses the cache.
|
|
|
|
o cached - semantic + cracking semantic
|
|
|
|
The function that cracks the instruction and enters
|
|
all values into the cache also contains a copy of the
|
|
semantic code (avoiding the need to call both the
|
|
cracker and the semantic function when there is a
|
|
cache miss).
|
|
|
|
For each of these general forms, several refinements can occure:
|
|
|
|
o do/don't duplicate/expand semantic functions
|
|
|
|
As a consequence of decoding an instruction, the
|
|
decoder, as part of its table may have effectivly made
|
|
certain of the variable fields in an instruction
|
|
constant. Separate functions for each of the
|
|
alternative values for what would have been treated as
|
|
a variable part can be created.
|
|
|
|
o use cache struct directly.
|
|
|
|
When a cracking cache is present, the semantic
|
|
functions can be generated to either hold intermediate
|
|
cache values in local variables or always refer to the
|
|
contents of the cache directly. */
|
|
|
|
|
|
|
|
|
|
|
|
|
|
extern void print_semantic_declaration
|
|
(lf *file,
|
|
insn_entry * insn,
|
|
opcode_bits *bits, insn_opcodes *opcodes, int nr_prefetched_words);
|
|
|
|
extern void print_semantic_definition
|
|
(lf *file,
|
|
insn_entry * insn,
|
|
opcode_bits *bits,
|
|
insn_opcodes *opcodes, cache_entry *cache_rules, int nr_prefetched_words);
|
|
|
|
|
|
typedef enum
|
|
{
|
|
invalid_illegal,
|
|
invalid_fp_unavailable,
|
|
invalid_wrong_slot,
|
|
}
|
|
invalid_type;
|
|
|
|
extern void print_idecode_invalid
|
|
(lf *file, const char *result, invalid_type type);
|
|
|
|
extern void print_semantic_body
|
|
(lf *file,
|
|
insn_entry * instruction,
|
|
opcode_bits *expanded_bits, insn_opcodes *opcodes);
|